JPH11345626A - Sealed battery - Google Patents
Sealed batteryInfo
- Publication number
- JPH11345626A JPH11345626A JP10150948A JP15094898A JPH11345626A JP H11345626 A JPH11345626 A JP H11345626A JP 10150948 A JP10150948 A JP 10150948A JP 15094898 A JP15094898 A JP 15094898A JP H11345626 A JPH11345626 A JP H11345626A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- wound
- electrode plate
- negative electrode
- positive electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Secondary Cells (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、密閉型電池に関
し、とくに容量密度が大きく、小型の機器にも使用可能
な密閉型二次電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed battery, and more particularly, to a sealed secondary battery having a large capacity density and usable for small-sized equipment.
【０００２】[0002]
【従来の技術】密閉型電池としては、アルカリ電解液、
酸性電解液、有機電解液等を用いたものが用いられてお
り、その構造については、円筒型、角型の構造を有した
ものが用いられている。小型の電子機器の電源として用
いられているリチウムイオン電池においては、正極集電
体および負極集電体にそれぞれ活物質を塗布した後に、
セパレータを介在させて巻回して電池缶内に収納して密
閉したものが用いられている。2. Description of the Related Art An alkaline electrolyte, a sealed battery,
An electrolyte using an acidic electrolyte, an organic electrolyte, or the like is used, and a structure having a cylindrical or square structure is used. In a lithium-ion battery used as a power source for small electronic devices, after applying an active material to each of the positive electrode current collector and the negative electrode current collector,
One that is wound with a separator interposed, housed in a battery can, and sealed is used.
【０００３】こうした電池は、図３に、リチウムイオン
電池の一部分解斜視図を示すように、図３（Ａ）に示す
円筒型電池、および図３（Ｂ）に示す角型電池が知られ
ている。 円筒型電池１は、セパレータ２を介在させて
正極側集電体に正極活物質を塗布した正極板３、負極側
集電体に負極活物質を塗布した負極板４を巻回した発電
要素からなるジェリーロール５を作製して電池缶６内に
収納して、電解液を注入後上部から電極ヘッダ７によっ
て密閉している。円筒型電池は、ジェリーロールを構成
する帯状体の幅および長さを大きくすることによって、
容量の大きな電池を作製することができるという特徴を
有している。[0003] As such batteries, a cylindrical battery shown in FIG. 3A and a prismatic battery shown in FIG. 3B are known as shown in FIG. I have. The cylindrical battery 1 is composed of a power generating element formed by winding a positive electrode plate 3 in which a positive electrode active material is coated on a positive electrode current collector with a separator 2 interposed, and a negative electrode plate 4 in which a negative electrode active material is coated on a negative electrode current collector. A jelly roll 5 was prepared and housed in a battery can 6, and was sealed with an electrode header 7 from above after the electrolyte was injected. By increasing the width and length of the band forming the jelly roll,
It has a feature that a battery having a large capacity can be manufactured.
【０００４】ところが、一般には直方体状の形状をした
電池収納部においては、円筒形状の電池では無効な容積
が大きくなるという問題があった。さらに、電池収納部
分の厚さによって円筒型の電池の径が制限を受けるの
で、小型、あるいは薄型の機器においては、円筒型の電
池に代えて、図２（Ｂ）に示すような、厚みの薄い角柱
状の角型電池８が用いられている。角型電池は、円筒型
電池と同様にセパレータ２を介在させて、正極活物質を
塗布した正極側集電体３と、負極活物質を塗布した負極
側集電体４を巻回して発電要素からなるジェリーロール
５を作製して電池缶６内に収納し、電解液を注入後上部
の電極ヘッダ７を電池缶６に溶接することによって電池
を密閉している。[0004] However, in a battery housing portion having a generally rectangular parallelepiped shape, there is a problem that an invalid volume is increased in a cylindrical battery. Further, since the diameter of the cylindrical battery is limited by the thickness of the battery housing portion, in a small or thin device, instead of the cylindrical battery, the thickness of the battery as shown in FIG. A thin prismatic prismatic battery 8 is used. The prismatic battery is formed by winding a positive-side current collector 3 coated with a positive-electrode active material and a negative-side current collector 4 coated with a negative-electrode active material with a separator 2 interposed therebetween as in the case of the cylindrical battery. The jelly roll 5 made of is made and stored in the battery can 6, and after the electrolyte is injected, the upper electrode header 7 is welded to the battery can 6 to seal the battery.
【０００５】角型電池は、円筒型電池に比べて機器内の
厚みの薄い小さな空間を有効に利用することができるの
で、携帯電話をはじめとする小型の機器類では、角型電
池が用いられている。[0005] A prismatic battery can effectively use a small space having a small thickness in a device as compared with a cylindrical battery. Therefore, a prismatic battery is used in small devices such as a cellular phone. ing.
【０００６】このような電池においては、電池の容量
は、電池缶内に収納されるジェリーロールの量に依存す
るので、ジェリーロールを密に巻回してその容積を小さ
くすることによって容積当たりの容量の大きな電池を得
ることができる。しかも、ジェリーロールを密に巻回す
ると、正極と負極との間隔も短くなり、電気抵抗が小さ
くなり電池特性上も好ましいものとすることができる。[0006] In such a battery, the capacity of the battery depends on the amount of the jelly roll accommodated in the battery can. Therefore, the capacity per volume is reduced by tightly winding the jelly roll to reduce the volume. Battery can be obtained. In addition, when the jelly roll is densely wound, the distance between the positive electrode and the negative electrode is shortened, the electric resistance is reduced, and the battery characteristics can be improved.
【０００７】図４に、円筒型電池および角型電池のジェ
リーロールの回転軸に垂直面での断面図を示す。図４
（Ａ）の円筒型電池においては、ジェリーロールを強く
巻回した場合でも、セパレータ２、正極板３、負極板４
は、いずれの部分も均等な圧力が加わるので、電気特性
上も好ましい電池を得ることができる。FIG. 4 is a sectional view of a cylindrical battery and a prismatic battery taken along a plane perpendicular to the rotation axis of the jelly roll. FIG.
In the cylindrical battery of (A), even when the jelly roll is strongly wound, the separator 2, the positive electrode plate 3, the negative electrode plate 4,
Since a uniform pressure is applied to any part of the battery, it is possible to obtain a battery that is favorable in electrical characteristics.
【０００８】しかしながら、図４（Ｂ）で示す角型の電
池では、ジェリーロールは、円筒型に比べて扁平の長円
渦巻状に巻回しているので、直線状部分９と曲線部分１
０の密着度に差が生じることは避けられなかった。強く
密に巻回すると、曲率半径の小さな部分への力の集中に
よって損傷を受けたり、電流の集中等によって不具合が
発生するので、角型電池用のジェリーロールでは、円筒
型に比べて強く密に巻回することができず、体積当たり
の容量密度は、円筒型に比べて充分なものではなかっ
た。However, in the prismatic battery shown in FIG. 4B, the jelly roll is wound in a flat elliptical spiral shape as compared with the cylindrical shape, so that the straight portion 9 and the curved portion 1 are not wound.
A difference in the degree of adhesion of 0 was inevitable. If it is wound tightly and tightly, it will be damaged by the concentration of force on the portion with a small radius of curvature, or it will cause trouble due to the concentration of current.Therefore, jelly rolls for prismatic batteries are stronger than cylinders. , And the volume density per volume was not sufficient as compared with the cylindrical type.
【０００９】また、正極にコバルト酸リチウム（ＬｉＣ
ｏＯ2 ）等のリチウムを含有した遷移金属酸化物や負極
に炭素質物質を用いると、充電時に正極ではリチウムイ
オンを脱ドープによって、また負極ではリチウムイオン
をドープによって両極物質が膨張する。円筒状に巻回し
たジェリーロールでは中心部から周辺部に向けて均等に
膨張するが、角型電池においては、とくに直線状の部分
が膨張し、電池缶の厚みを膨張させるという現象も生
じ、小型の機器内に装着した場合には、電池缶が厚み方
向に膨張して、機器を圧迫する等の問題が生じることが
あった。Also, lithium cobaltate (LiC) is used for the positive electrode.
When a transition metal oxide containing lithium such as oO 2 ) or a carbonaceous material is used for the negative electrode, the bipolar material expands by undoping lithium ions at the positive electrode and lithium ions at the negative electrode during charging. In a jelly roll wound in a cylindrical shape, it expands uniformly from the center to the periphery, but in a rectangular battery, a linear part expands in particular, causing a phenomenon that the thickness of the battery can expands, When the battery can is mounted in a small device, the battery can expands in the thickness direction, which may cause problems such as pressing the device.
【００１０】また、密閉型の二次電池の構造としては、
古くから円筒型電池と扁平型電池が知られていた。例え
ば、「電池ハンドブック」（昭和５５年４月２５日 電
気書院発行）の第３章１１２ページには、正極板と負極
板をセパレータを介して巻回した円筒型電池と、円板状
の正極板と負極板をセパレータを介して扁平な円筒状の
電池缶に収納したものが示されている。ここでは、円筒
型電池においては巻回したジェリーロールを用いること
が記載されているが、扁平型の電池においては、巻回し
た発電要素を用いることは行われていなかったことを示
している。The structure of the sealed secondary battery is as follows.
Cylindrical batteries and flat batteries have been known for a long time. For example, Chapter 3, page 112 of the Battery Handbook (published by Denki Shoin on April 25, 1980) states that a cylindrical battery in which a positive electrode plate and a negative electrode plate are wound via a separator, and a disk-shaped positive electrode A plate and a negative electrode plate which are housed in a flat cylindrical battery can via a separator are shown. Here, it is described that a wound jelly roll is used in a cylindrical battery, but that a wound power generating element is not used in a flat battery.
【００１１】[0011]
【発明が解決しようとする課題】本発明は、小型の電池
においても容積当たりの容量密度を高くすることがで
き、角型電池のように膨張による電池缶の膨らみもな
く、取り扱いが容易な電池を提供することを課題とする
ものである。SUMMARY OF THE INVENTION The present invention provides a battery which can increase the capacity density per volume even in a small battery, does not swell the battery can due to expansion like a square battery, and is easy to handle. It is an object to provide
【００１２】[0012]
【課題を解決するための手段】本発明は、密閉型電池に
おいて、帯状の正極および負極をセパレータを介して巻
回した巻回体からなる発電要素を有し、巻回体は巻回の
中心軸方向の高さが中心軸に垂直の方向の大きさよりも
小さな形状を有している密閉型電池である。巻回体が円
筒状もしくは角柱の角部を丸めた形状を有する密閉型電
池である。円筒状の発電要素を収納した電池が扁平角型
もしくは扁平円筒状である密閉型電池である。また、リ
チウムイオンをドープおよび脱ドープする正極および負
極を有するリチウムイオン二次電池である前記の密閉型
電池である。According to the present invention, there is provided a sealed battery having a power generating element comprising a wound body in which a belt-like positive electrode and a negative electrode are wound with a separator interposed therebetween, wherein the wound body has a center of winding. The sealed battery has a shape in which the height in the axial direction is smaller than the size in the direction perpendicular to the central axis. This is a sealed battery in which the winding body has a cylindrical shape or a shape in which the corners of a prism are rounded. A battery containing a cylindrical power generating element is a sealed battery having a flat rectangular shape or a flat cylindrical shape. Further, the above sealed battery is a lithium ion secondary battery having a positive electrode and a negative electrode doped and dedoped with lithium ions.
【００１３】[0013]
【発明の実施の形態】本発明は、発電要素を巻回した密
閉型の電池において、発電要素を円筒状に巻回したジェ
リーロールの径をジェリーロールの高さよりも大きくし
た扁平状のジェリーロールを扁平円筒状、あるいは扁平
直方体状の電池缶内に収容したものであり、小型の電池
にあっても円筒型の電池と同様の特性と容量密度を得る
ことができる電池を提供するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealed jelly roll in which a power generating element is wound, wherein the diameter of the jelly roll in which the power generating element is wound in a cylindrical shape is larger than the height of the jelly roll. Is provided in a flat cylindrical or flat rectangular parallelepiped battery can, and provides a battery capable of obtaining the same characteristics and capacity density as a cylindrical battery even in a small battery. .
【００１４】以下に、本発明を図面を参照して説明す
る。図１は、本発明の密閉型電池の一実施例を説明する
図である。図１（Ａ）は、本発明の電池において発電要
素として使用するジェリーロールを説明する斜視図であ
る。本発明の電池のジェリーロール５は、正極側集電体
に正極活物質を塗布した正極板３と、負極側集電体に負
極活物質を塗布した負極板４を、セパレータ２を介在さ
せて円筒状に巻回したものであり、ジェリーロール５の
高さ５ａが直径５ｂに比べて小さな扁平な円筒状の形状
であり、正極導電タブ１１および負極導電タブ１２を有
している。本発明のジェリーロールは、円筒状に巻回し
ているので、ジェリーロールには均等な力が加わるの
で、密に巻回しても一部への圧力集中により巻回体に電
流の集中箇所が生じる等の問題がないので、密に巻回し
たジェリーロールを得ることができる。The present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating an embodiment of the sealed battery of the present invention. FIG. 1A is a perspective view illustrating a jelly roll used as a power generating element in the battery of the present invention. The jelly roll 5 of the battery of the present invention comprises a positive electrode plate 3 in which a positive electrode active material is applied to a positive electrode current collector, and a negative electrode plate 4 in which a negative electrode active material is applied to a negative electrode current collector, with a separator 2 interposed therebetween. The jelly roll 5 has a flat cylindrical shape in which the height 5a is smaller than the diameter 5b and has a positive electrode conductive tab 11 and a negative electrode conductive tab 12. Since the jelly roll of the present invention is wound in a cylindrical shape, a uniform force is applied to the jelly roll, so that even if the jelly roll is densely wound, a concentrated portion of current is generated in the wound body due to pressure concentration on a part. Therefore, a jelly roll wound tightly can be obtained.
【００１５】また、図１（Ｂ）は、本発明の電池の一実
施例の斜視図を説明する図である。図１（Ｂ）は、ジェ
リーロールを角型の容器に収納した扁平型角型電池１３
を示す図であり、ジェリーロールの巻回軸に垂直な面が
角型電池の面積が大きな面に位置している。充電によっ
てジェリーロールが膨張した場合には、ジェリーロール
は巻回軸に垂直方向へと膨張するが、巻回軸に対して垂
直方向面１５は、巻回軸方向面１４と比べて面積が小さ
く、電池缶の各部の厚さが同一の厚さの場合には、面積
が小さいので、大きな膨張圧力に耐えることができる。FIG. 1B is a diagram illustrating a perspective view of an embodiment of the battery of the present invention. FIG. 1B shows a flat rectangular battery 13 in which a jelly roll is housed in a rectangular container.
FIG. 3 is a diagram showing a surface perpendicular to the winding axis of the jelly roll is located on a surface having a large area of the rectangular battery. When the jelly roll expands due to charging, the jelly roll expands in a direction perpendicular to the winding axis, but the surface 15 perpendicular to the winding axis has a smaller area than the surface 14 in the winding axis direction. When the thickness of each part of the battery can is the same, since the area is small, it can withstand a large expansion pressure.
【００１６】また、図１（Ｃ）は、本発明の電池の他の
実施例の斜視図を説明する図である。 図１（Ｃ）は、
図１（Ａ）に示す扁平なジェリーロールを円筒型の容器
に収納した扁平型円筒型電池１６を示すものであり、一
般の円筒型の電池と同様に、充電よって膨張した場合に
は、円筒面によって圧力が保持されるので、厚みが薄い
材料を用いても大きな膨張圧力を保持することができ
る。FIG. 1C is a diagram for explaining a perspective view of another embodiment of the battery of the present invention. FIG. 1 (C)
1A shows a flat cylindrical battery 16 in which the flat jelly roll shown in FIG. 1A is housed in a cylindrical container. As shown in FIG. Since the pressure is held by the surface, a large inflation pressure can be held even when a thin material is used.
【００１７】図１（Ｂ）および図１（Ｃ）で示した電池
は、扁平な構造を有しているので、小型の電子機器のよ
うな電池収納部の大きさの制限から円筒型の電池を利用
することができなかった機器類においても、円筒状のジ
ェリーロールを収納した特性の優れた電池を用いること
が可能となる。Since the batteries shown in FIGS. 1B and 1C have a flat structure, a cylindrical battery is limited due to the limitation of the size of a battery housing such as a small electronic device. It is possible to use a battery having excellent characteristics in which a cylindrical jelly roll is housed even in a device that cannot use the battery.
【００１８】また、図２は、本発明の他の実施例を説明
する図であり、電池缶をジェリーロールの巻回軸に垂直
な面で切断した平面図である。扁平なジェリーロール５
は、巻回軸に垂直な断面で切断した形状が、円形である
ことが好ましいが、図２に示すように、ジェリーロール
が角型の容器の内面に沿って角柱の角部１７を丸めた概
ね円筒と称するような構造のものも用いることができ
る。FIG. 2 is a view for explaining another embodiment of the present invention, and is a plan view of a battery can cut along a plane perpendicular to a winding axis of a jelly roll. Flat jelly roll 5
It is preferable that the shape cut in a cross section perpendicular to the winding axis is circular, but as shown in FIG. 2, the jelly roll rounds the corner 17 of the prism along the inner surface of the rectangular container. A structure generally called a cylinder can also be used.
【００１９】[0019]
【発明の効果】正極板および負極板をセパレータを介し
て巻回した発電要素を巻回軸の方向の高さに比べて径を
大きくした扁平状としたので、密に巻回することができ
るので円筒型電池と同様の特性を有する扁平状の電池を
得ることができる。According to the present invention, since the power generating element in which the positive electrode plate and the negative electrode plate are wound with the separator interposed therebetween has a flat shape whose diameter is larger than the height in the direction of the winding axis, it can be densely wound. Therefore, a flat battery having the same characteristics as the cylindrical battery can be obtained.
【図１】図１は、本発明の密閉型電池の一実施例を説明
する図である。FIG. 1 is a diagram illustrating an embodiment of a sealed battery according to the present invention.
【図２】図２は、本発明の他の実施例を説明する図であ
り、電池缶をジェリーロールの巻回軸に垂直な面で切断
した平面図である。FIG. 2 is a view for explaining another embodiment of the present invention, and is a plan view of a battery can cut along a plane perpendicular to a winding axis of a jelly roll.
【図３】図３は、リチウムイオン電池の一部分解斜視図
を説明する図である。FIG. 3 is a diagram illustrating a partially exploded perspective view of a lithium ion battery.
【図４】図４は、円筒型電池および角型電池のジェリー
ロールの回転軸に垂直面での断面図を示す図である。FIG. 4 is a diagram showing a sectional view of a jelly roll of a cylindrical battery and a rectangular battery taken along a plane perpendicular to a rotation axis thereof.
１…円筒型電池、２…セパレータ、３…正極板、４…負
極板、５…ジェリーロール、６…電池缶、７…電極ヘッ
ダ、８…角型電池、９…直線状部分、１０…曲線部分、
１１…正極導電タブ、１２…負極導電タブ、１３…扁平
型角型電池、１４…巻回軸に対して垂直方向面、１５…
巻回軸方向面、１６…扁平型円筒型電池、１７…角部DESCRIPTION OF SYMBOLS 1 ... Cylindrical battery, 2 ... Separator, 3 ... Positive electrode plate, 4 ... Negative electrode plate, 5 ... Jerry roll, 6 ... Battery can, 7 ... Electrode header, 8 ... Square battery, 9 ... Linear part, 10 ... Curve part,
11: positive electrode conductive tab, 12: negative electrode conductive tab, 13: flat rectangular battery, 14: surface perpendicular to the winding axis, 15 ...
Winding axial direction surface, 16: flat cylindrical battery, 17: corner
Claims (4)
負極をセパレータを介して巻回した巻回体からなる発電
要素を有し、巻回体は巻回の中心軸方向の高さが中心軸
に垂直の方向の大きさよりも小さな形状を有しているこ
とを特徴とする密閉型電池。1. A sealed battery comprising a power generating element comprising a wound body in which a belt-shaped positive electrode and a negative electrode are wound with a separator interposed therebetween, wherein the wound body has a height in a central axis direction of the wound center axis. A sealed battery having a shape smaller than a size in a direction perpendicular to the battery.
めた形状を有することを特徴とする請求項１記載の密閉
型電池。2. The sealed battery according to claim 1, wherein the wound body has a cylindrical shape or a shape in which a corner of a prism is rounded.
しくは扁平円筒状であることを特徴とする請求項１また
は２項のいずれかに記載の密閉型電池。3. The sealed battery according to claim 1, wherein the battery accommodating the power generating element has a flat rectangular shape or a flat cylindrical shape.
する正極および負極を有するリチウムイオン二次電池で
あることを特徴とする請求項１ないし３項のいずれかに
記載の密閉型電池。4. The sealed battery according to claim 1, wherein the sealed battery is a lithium ion secondary battery having a positive electrode and a negative electrode doped and dedoped with lithium ions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10150948A JPH11345626A (en) | 1998-06-01 | 1998-06-01 | Sealed battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10150948A JPH11345626A (en) | 1998-06-01 | 1998-06-01 | Sealed battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11345626A true JPH11345626A (en) | 1999-12-14 |
Family
ID=15507927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10150948A Pending JPH11345626A (en) | 1998-06-01 | 1998-06-01 | Sealed battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11345626A (en) |
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-
1998
- 1998-06-01 JP JP10150948A patent/JPH11345626A/en active Pending
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